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  #1  
Old 06-30-2016, 04:35 AM
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Engine power figures, at flywheel, or wheels?

Hi all,

Can anyone answer this for me please?

My 1982 Mercedes w123 280e(euro), with the M110 engine, has a claimed power of 185bhp.
Is that power figure at the flywheel, or at the wheels?

Cheers Frank.
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  #2  
Old 06-30-2016, 05:09 AM
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I'm pretty sure that's at the crankshaft (with accessories that are mounted on the front of the engine).
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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,
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Old 06-30-2016, 05:21 AM
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That's what I thought, seeing as it appears to be the quoted engine power figure regardless of the car it's in.

I just wanted to make sure as I was curious at my power increase since converting to EFI and coilpack ignition.

I've now got 199.8bhp at the wheels, which equates to around 240bhp at the flywheel.

It seems a massive increase for just swapping to throttle bodies, and a straight through exhaust system.
Goes to show the power that is available from the engine with a little work.
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Old 06-30-2016, 10:13 AM
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Did you test prior to making the change?

How do you determine the 199.8bhp at the wheels equates to 240bhp at the flywheel??
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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,
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  #5  
Old 06-30-2016, 10:27 AM
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199.8bhp is based on an average of 10 power runs on the dyno, after mapping the EFI.

240bhp at the flywheel, is a rough estimate, based on previous experience, of both me, and several of my friends.
40bhp is a fair guess for parasitic loss, from the drivetrain and ancillaries.

Last edited by fha772; 06-30-2016 at 10:41 AM.
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  #6  
Old 06-30-2016, 01:01 PM
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fha:

What type of dynamometer was used: water brake, eddy current brake, AC brake, inertial, etc., and what brand?
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  #7  
Old 07-06-2016, 03:59 PM
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Quote:
Originally Posted by fha772 View Post
That's what I thought, seeing as it appears to be the quoted engine power figure regardless of the car it's in.

I just wanted to make sure as I was curious at my power increase since converting to EFI and coilpack ignition.

I've now got 199.8bhp at the wheels, which equates to around 240bhp at the flywheel.

It seems a massive increase for just swapping to throttle bodies, and a straight through exhaust system.
Goes to show the power that is available from the engine with a little work.
I still crack up reading the AMG brochures for the mid 70's M110. $5K for the parts to gain 25HP, something any competent muffler shop could have done for $200.
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Old 07-06-2016, 04:09 PM
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Frank Reiner, sorry I've taken so long to reply, the dyno is apparently an ac brake type, but I didn't ask what brand it is.

jdhill, it does seem a lot for the power increase, to be honest from what I've managed to find out, the only difference between a standard euro model and an AMG is the camshafts.

I'm planning to have a dbilas regrind on my camshafts this winter, which is pretty close to the AMG specs, and I'm also finally getting round to fitting the turbo too, which should see around 280-300bhp at the wheels.
I've also got a Ford Sierra Cosworth LSD to fit and a 190e 2.5-16v dogleg gearbox, that might find it's way into it too.
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  #9  
Old 07-06-2016, 06:58 PM
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Quote:
Originally Posted by fha772 View Post
Frank Reiner, sorry I've taken so long to reply, the dyno is apparently an ac brake type, but I didn't ask what brand it is.
Perhaps you could post up some pictures of the traces that were generated by the dyno pulls.
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  #10  
Old 07-09-2016, 02:13 PM
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Quote:
Originally Posted by fha772 View Post

jdhill, it does seem a lot for the power increase, to be honest from what I've managed to find out, the only difference between a standard euro model and an AMG is the camshafts.

.
Can't find the other pic's and price list I have. They did throw in a snappy valve cover with AMG on it. From 185 to 210, what a bargain.
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Engine power figures, at flywheel, or wheels?-amg_m110-tune-up-kit.jpg  
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